Which condition would lead to a likely increase in the number of fragments produced during a restriction endonuclease (RE) digestion reaction?

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BlackTom AI · Accepted Answer

Original question: Which condition would lead to a likely increase in the number of fragments produced during a restriction endonuclease (RE) digestion reaction?
Option 1: None of these conditions would be likely to increase the number of fragments generated.
This statement asserts that none of the listed conditions would raise fragment count. To evaluate this, we need to consider how fragment numbers change with respect to recognition site frequency and DNA length. In typical RE digestion, the number of fragments depends on how many times the enzyme finds its recognition site within the target DNA. More sites generally yield more fragments, while fewer sites yield fewer fragments.
Option 2: Use of a RE with a longer recognition site
A longer recognition site would, on average, occur less frequently within a given DNA sequence, because longer sequences are less likely to be present by chance. Consequently, this would reduce the number of cuts and thus decrease the number of fragments, not increase it. Therefore this option would not increase fragment number and is incorrect for the stated question.
Option 3: Use of a target DNA with a shorter length
Shortening the target DNA could affect fragment count in a couple of ways, but it does not inherently guarantee an increase in fragment number. If a shorter DNA piece contains fewer recognition sites, the number of fragments could stay the same or even decrease. If somehow the shorter DNA retains or concentrates sites such that more cuts occur relative to its length, you might see more fragments, but this scenario is not a general rule and typically shorter DNA does not automatically lead to more fragments. Thus this option is not reliably associated with an increase in fragment number and is not a safe generalization.
Option 4: Use of a RE that produces sticky ends on the fragments
Whether an RE leaves sticky ends or blunt ends does not change how many times the enzyme cuts; it only changes the nature of the ends produced. The number of fragments depends on the number of recognition sites cut, not on the type of ends generated. Therefore this option would not inherently increase fragment count.
Putting these assessments together, none of the listed conditions are reliably expected to increase the number of fragments produced. The most accurate answer, given these options, is that none of these conditions would be likely to increase fragment number, which aligns with the core principle that fragment count is determined by recognition-site frequency and DNA length context rather than end type or simply a longer site.
Note: The reasoning above weighs typical expectations in restriction digestion. In special cases with particular DNA sequences and site distributions, outcomes could vary, but the question targets general principles, making option 1 the correct general choice.

BIOL_2004_81774_202509 Homework 4

Which condition would lead to a likely increase in the number of fragments produced during a restriction endonuclease (RE) digestion reaction?

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